<!DOCTYPE html>
<html lang="en">





<head>
  <meta charset="UTF-8">
  <link rel="apple-touch-icon" sizes="76x76" href="/img/favicon.png">
  <link rel="icon" type="image/png" href="/img/favicon.png">
  <meta name="viewport"
        content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, shrink-to-fit=no">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  
  <meta name="theme-color" content="#2f4154">
  <meta name="description" content="My Personal Website For Blog">
  <meta name="author" content="黄宇辉">
  <meta name="keywords" content="learning note,hexo blog">
  <title>DBUtils - 欢迎参观小灰灰的网站哟 ヾ(◍°∇°◍)ﾉﾞ ~</title>

  <link  rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.4.1/css/bootstrap.min.css" />


  <link  rel="stylesheet" href="https://cdn.staticfile.org/github-markdown-css/4.0.0/github-markdown.min.css" />
  <link  rel="stylesheet" href="/lib/hint/hint.min.css" />

  
    <link  rel="stylesheet" href="https://cdn.staticfile.org/highlight.js/10.0.0/styles/vs2015.min.css" />
  

  


<!-- 主题依赖的图标库，不要自行修改 -->
<link rel="stylesheet" href="//at.alicdn.com/t/font_1749284_yg9cfy8wd6.css">

<link rel="stylesheet" href="//at.alicdn.com/t/font_1736178_pjno9b9zyxs.css">

<link  rel="stylesheet" href="/css/main.css" />

<!-- 自定义样式保持在最底部 -->


  <script  src="/js/utils.js" ></script>
</head>


<body>
  <header style="height: 70vh;">
    <nav id="navbar" class="navbar fixed-top  navbar-expand-lg navbar-dark scrolling-navbar">
  <div class="container">
    <a class="navbar-brand"
       href="/">&nbsp;<strong>ANONYMOUS</strong>&nbsp;</a>

    <button id="navbar-toggler-btn" class="navbar-toggler" type="button" data-toggle="collapse"
            data-target="#navbarSupportedContent"
            aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
      <div class="animated-icon"><span></span><span></span><span></span></div>
    </button>

    <!-- Collapsible content -->
    <div class="collapse navbar-collapse" id="navbarSupportedContent">
      <ul class="navbar-nav ml-auto text-center">
        
          
          
          
          
            <li class="nav-item">
              <a class="nav-link" href="/">
                <i class="iconfont icon-home-fill"></i>
                Home
              </a>
            </li>
          
        
          
          
          
          
            <li class="nav-item">
              <a class="nav-link" href="/archives/">
                <i class="iconfont icon-archive-fill"></i>
                Archives
              </a>
            </li>
          
        
          
          
          
          
            <li class="nav-item">
              <a class="nav-link" href="/tags/">
                <i class="iconfont icon-tags-fill"></i>
                Tags
              </a>
            </li>
          
        
          
          
          
          
            <li class="nav-item">
              <a class="nav-link" href="/about/">
                <i class="iconfont icon-user-fill"></i>
                About
              </a>
            </li>
          
        
        
          <li class="nav-item" id="search-btn">
            <a class="nav-link" data-toggle="modal" data-target="#modalSearch">&nbsp;&nbsp;<i
                class="iconfont icon-search"></i>&nbsp;&nbsp;</a>
          </li>
        
      </ul>
    </div>
  </div>
</nav>

    <div class="view intro-2" id="background" parallax=true
         style="background: url('/img/default.png') no-repeat center center;
           background-size: cover;">
      <div class="full-bg-img">
        <div class="mask flex-center" style="background-color: rgba(0, 0, 0, 0.3)">
          <div class="container text-center white-text fadeInUp">
            <span class="h2" id="subtitle">
              
            </span>

            
              
  <div class="mt-3 post-meta">
    <i class="iconfont icon-date-fill" aria-hidden="true"></i>
    <time datetime="2019-05-30 17:28">
      May 30, 2019 pm
    </time>
  </div>


<div class="mt-1">
  
    
    <span class="post-meta mr-2">
      <i class="iconfont icon-chart"></i>
      1.4k 字
    </span>
  

  
    
    <span class="post-meta mr-2">
      <i class="iconfont icon-clock-fill"></i>
      
      
      24
       分钟
    </span>
  

  
  
</div>

            
          </div>

          
        </div>
      </div>
    </div>
  </header>

  <main>
    
      

<div class="container-fluid">
  <div class="row">
    <div class="d-none d-lg-block col-lg-2"></div>
    <div class="col-lg-8 nopadding-md">
      <div class="container nopadding-md" id="board-ctn">
        <div class="py-5" id="board">
          <div class="post-content mx-auto" id="post">
            
            <article class="markdown-body">
              <h2 id="学习笔记-DBUtils工具"><a href="#学习笔记-DBUtils工具" class="headerlink" title="学习笔记 : DBUtils工具"></a>学习笔记 : DBUtils工具</h2><p><em>简介 : 为了更加简单地使用<code>JDBC</code>,Apache组织提供了一个工具类库<code>commons-dbutils</code>,它是操作数据库的一个组件,实现了对JDBC的简单封装,可以在不影响性能的情况下极大地简化JDBC的编码工作量.</em></p>
<h3 id="API-介绍"><a href="#API-介绍" class="headerlink" title="API 介绍"></a>API 介绍</h3><p><em>简介 : <code>commons-dbutils</code>的核心是两个类为<code>DbUtils</code>,<code>QueryRunner</code>,和一个接口<code>ResultSetHandler</code></em>.</p>
<ol>
<li><em><code>org.apache.commons.dbutils.DbUtils</code> : 该类主要为如何关闭数据库连接,装载JDBC驱动程序之类的常规工作提供静态方法.</em></li>
<li><em><code>org.apache.commons.dbutils.QueryRunner</code> : 该类简化了执行SQL语句的代码,它与<code>ResultSetHandler</code>组合在一起就能完成大部分的数据库操作,大大减少编码量.</em></li>
<li><em><code>org.apache.commons.dbutils.ResultSetHandler</code> : 该接口用于处理ResultSet结果集,它可以将结果集中的数据转换为不同的形式.</em></li>
</ol>
<h3 id="CURE-案例"><a href="#CURE-案例" class="headerlink" title="CURE 案例"></a>CURE 案例</h3><ol>
<li><p><em>数据表信息</em></p>
<div class="hljs"><pre><code class="hljs sql"><span class="hljs-comment">-- auto-generated definition by Intellij IDEA</span>
<span class="hljs-keyword">create</span> <span class="hljs-keyword">table</span> <span class="hljs-keyword">user</span>
(
    <span class="hljs-keyword">id</span>       <span class="hljs-built_in">int</span> auto_increment primary <span class="hljs-keyword">key</span>,
    <span class="hljs-keyword">name</span>     <span class="hljs-built_in">varchar</span>(<span class="hljs-number">15</span>) <span class="hljs-literal">null</span>,
    <span class="hljs-keyword">password</span> <span class="hljs-built_in">varchar</span>(<span class="hljs-number">20</span>) <span class="hljs-literal">null</span>
)</code></pre></div>
</li>
<li><p><em>C3P0配置文件</em></p>
<div class="hljs"><pre><code class="hljs xml"><span class="hljs-meta">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">c3p0-config</span>&gt;</span>
    <span class="hljs-comment">&lt;!-- 默认配置: 在没有指定配置时默认使用该配置创建c3p0数据源对象 --&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">default-config</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"user"</span>&gt;</span>xxxxxx<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"password"</span>&gt;</span>xxxxxx<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"driverClass"</span>&gt;</span>com.mysql.cj.jdbc.Driver<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"jdbcUrl"</span>&gt;</span>
            jdbc:mysql://LOCALHOST/test?useSSL=false&amp;amp;serverTimezone=UTC&amp;amp;allowPublicKeyRetrieval=true
        <span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"checkoutTimeout"</span>&gt;</span>30000<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"initialPoolSize"</span>&gt;</span>5<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"maxIdleTime"</span>&gt;</span>600<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"maxPoolSize"</span>&gt;</span>10<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"minPoolSize"</span>&gt;</span>1<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"maxStatements"</span>&gt;</span>200<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">default-config</span>&gt;</span>

    <span class="hljs-comment">&lt;!-- 自定义配置 --&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">named-config</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"yu"</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"user"</span>&gt;</span>xxxxxx<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"password"</span>&gt;</span>xxxxxx<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"driverClass"</span>&gt;</span>com.mysql.cj.jdbc.Driver<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"jdbcUrl"</span>&gt;</span>
            jdbc:mysql://LOCALHOST/test?useSSL=false&amp;amp;serverTimezone=UTC&amp;amp;allowPublicKeyRetrieval=true
        <span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"initiaPoolSize"</span>&gt;</span>5<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
        <span class="hljs-tag">&lt;<span class="hljs-name">property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"maxPoolSize"</span>&gt;</span>15<span class="hljs-tag">&lt;/<span class="hljs-name">property</span>&gt;</span>
    <span class="hljs-tag">&lt;/<span class="hljs-name">named-config</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">c3p0-config</span>&gt;</span></code></pre></div>
</li>
<li><p><em>数据源工具类</em></p>
<div class="hljs"><pre><code class="hljs java"><span class="hljs-keyword">package</span> pers.huangyuhui.dbutils.utils;

<span class="hljs-keyword">import</span> com.mchange.v2.c3p0.ComboPooledDataSource;

<span class="hljs-keyword">import</span> javax.sql.DataSource;

<span class="hljs-comment">/**
 * <span class="hljs-doctag">@project</span>: dbutils
 * <span class="hljs-doctag">@package</span>: pers.huangyuhui.dbutils.utils
 * <span class="hljs-doctag">@description</span>: 创建数据源
 * <span class="hljs-doctag">@author</span>: HuangYuhui
 * <span class="hljs-doctag">@date</span>: 5/31/2019-7:00 PM
 * <span class="hljs-doctag">@version</span>: 1.0
 */</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">C3P0Utils</span> </span>&#123;

    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> DataSource dataSource;

    <span class="hljs-comment">//创建数据源</span>
    <span class="hljs-keyword">static</span> &#123;
        dataSource = <span class="hljs-keyword">new</span> ComboPooledDataSource(<span class="hljs-string">"yu"</span>);
    &#125;

    <span class="hljs-comment">//获取数据源</span>
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> DataSource <span class="hljs-title">getDataSource</span><span class="hljs-params">()</span> </span>&#123;
        <span class="hljs-keyword">return</span> dataSource;
    &#125;

&#125;</code></pre></div>
</li>
<li><p><em>Java Bean : 存储用户信息</em></p>
<div class="hljs"><pre><code class="hljs java"><span class="hljs-keyword">package</span> pers.huangyuhui.dbutils.bean;

<span class="hljs-comment">/**
 * <span class="hljs-doctag">@project</span>: dbutils
 * <span class="hljs-doctag">@package</span>: pers.huangyuhui.dbutils.bean
 * <span class="hljs-doctag">@description</span>: 用户信息
 * <span class="hljs-doctag">@author</span>: HuangYuhui
 * <span class="hljs-doctag">@date</span>: 5/31/2019-7:13 PM
 * <span class="hljs-doctag">@version</span>: 1.0
 */</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">User</span> </span>&#123;

    <span class="hljs-keyword">private</span> Integer id;
    <span class="hljs-keyword">private</span> String name;
    <span class="hljs-keyword">private</span> String password;

    <span class="hljs-function"><span class="hljs-keyword">public</span> Integer <span class="hljs-title">getId</span><span class="hljs-params">()</span> </span>&#123;
        <span class="hljs-keyword">return</span> id;
    &#125;

    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setId</span><span class="hljs-params">(Integer id)</span> </span>&#123;
        <span class="hljs-keyword">this</span>.id = id;
    &#125;

    <span class="hljs-function"><span class="hljs-keyword">public</span> String <span class="hljs-title">getName</span><span class="hljs-params">()</span> </span>&#123;
        <span class="hljs-keyword">return</span> name;
    &#125;

    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setName</span><span class="hljs-params">(String name)</span> </span>&#123;
        <span class="hljs-keyword">this</span>.name = name;
    &#125;

    <span class="hljs-function"><span class="hljs-keyword">public</span> String <span class="hljs-title">getPassword</span><span class="hljs-params">()</span> </span>&#123;
        <span class="hljs-keyword">return</span> password;
    &#125;

    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setPassword</span><span class="hljs-params">(String password)</span> </span>&#123;
        <span class="hljs-keyword">this</span>.password = password;
    &#125;

    <span class="hljs-meta">@Override</span>
    <span class="hljs-function"><span class="hljs-keyword">public</span> String <span class="hljs-title">toString</span><span class="hljs-params">()</span> </span>&#123;
        <span class="hljs-keyword">return</span> <span class="hljs-string">"User&#123;"</span> +
                <span class="hljs-string">"id="</span> + id +
                <span class="hljs-string">", name='"</span> + name + <span class="hljs-string">'\''</span> +
                <span class="hljs-string">", password='"</span> + password + <span class="hljs-string">'\''</span> +
                <span class="hljs-string">'&#125;'</span>;
    &#125;
&#125;</code></pre></div>
</li>
<li><p><em>DAO层 : 封装数据库的基本操作</em></p>
<div class="hljs"><pre><code class="hljs java">package pers.huangyuhui.dbutils.dao;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import pers.huangyuhui.dbutils.bean.User;
import pers.huangyuhui.dbutils.utils.C3P0Utils;

import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.List;

/**
 * @project: dbutils
 * @package: pers.huangyuhui.dbutils
 * @description: 数据库的基本操作
 * @author: HuangYuhui
 * @date: 5/31/2019-7:07 PM
 * @version: 1.0
 */
public class DBUtilsDao &#123;

    //获取数据源
    private static DataSource dataSource = C3P0Utils.getDataSource();
    //创建queryRunner对象
    private static QueryRunner queryRunner = new QueryRunner(dataSource);
    //sql
    private String SQL_SELECT = "select id,name,password from user where id = ?";
    private String SQL_UPDATE = "update user set name=?,password=? where id=?";
    private String SQL_INSERT = "insert into user(name,password) values(?,?)";
    private String SQL_SELECTALL = "select id,name,password from user";
    private String SQL_DELETE = "delete from user where id=?";

    // TODO: 6/8/2019 查询所有用户信息
    public List selectAll() throws SQLException &#123;
        //获取用户列表
        List&lt;User&gt; list = queryRunner.query(SQL_SELECTALL, new BeanListHandler&lt;User&gt;(User.class));
        return list;
    &#125;

    // TODO: 6/8/2019 查询单个用户信息
    public User select(int id) throws SQLException &#123;
        //获取用户信息
        User user = queryRunner.query(SQL_SELECT, new BeanHandler&lt;&gt;(User.class), new Object[]&#123;id&#125;);
        return user;
    &#125;

    // TODO: 6/8/2019 添加用户信息
    public boolean insert(User user) throws SQLException &#123;
        //判断是否添加成功
        int num = queryRunner.update(SQL_INSERT, new Object[]&#123;user.getName(), user.getPassword()&#125;);
        if (num &gt; 0) &#123;
            return true;
        &#125;
        return false;
    &#125;

    // TODO: 6/8/2019 修改用户信息
    public boolean update(User user) throws SQLException &#123;
        int num = queryRunner.update(SQL_UPDATE, new Object[]&#123;user.getName(), user.getPassword(), user.getId()&#125;);
        if (num &gt; 0) &#123;
            return true;
        &#125;
        return false;
    &#125;

    // TODO: 6/8/2019 删除用户信息
    public boolean delete(int id) throws SQLException &#123;
        int num = queryRunner.update(SQL_DELETE, id);
        if (num &gt; 0) &#123;
            return true;
        &#125; else &#123;
            return false;
        &#125;
    &#125;
&#125;</code></pre></div>
</li>
<li><p><em>测试类</em></p>
<div class="hljs"><pre><code class="hljs java"><span class="hljs-keyword">package</span> pers.huangyuhui.dbutils.test;

<span class="hljs-keyword">import</span> org.junit.BeforeClass;
<span class="hljs-keyword">import</span> org.junit.Ignore;
<span class="hljs-keyword">import</span> org.junit.Test;
<span class="hljs-keyword">import</span> pers.huangyuhui.dbutils.bean.User;
<span class="hljs-keyword">import</span> pers.huangyuhui.dbutils.dao.DBUtilsDao;

<span class="hljs-keyword">import</span> java.sql.SQLException;
<span class="hljs-keyword">import</span> java.util.List;

<span class="hljs-comment">/**
 * <span class="hljs-doctag">@project</span>: dbutils
 * <span class="hljs-doctag">@description</span>: 测试数据库的基本操作
 * <span class="hljs-doctag">@author</span>: HuangYuhui
 * <span class="hljs-doctag">@date</span>: 5/31/2019-7:45 PM
 * <span class="hljs-doctag">@version</span>: 1.0
 */</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">DBUtilsDaoTest</span> </span>&#123;

    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> User user;
    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> DBUtilsDao dbUtilsDao;

    <span class="hljs-meta">@BeforeClass</span>
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">init</span><span class="hljs-params">()</span> </span>&#123;
        user = <span class="hljs-keyword">new</span> User();
        dbUtilsDao = <span class="hljs-keyword">new</span> DBUtilsDao();
    &#125;

    <span class="hljs-meta">@Ignore</span>
    <span class="hljs-meta">@Test</span>
    <span class="hljs-comment">// <span class="hljs-doctag">TODO:</span> 6/8/2019 测试添加用户操作</span>
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">insertTest</span><span class="hljs-params">()</span> <span class="hljs-keyword">throws</span> SQLException </span>&#123;
        user.setName(<span class="hljs-string">"YUbuntu0109"</span>);
        user.setPassword(<span class="hljs-string">"MyPassword"</span>);
        <span class="hljs-keyword">if</span> (dbUtilsDao.insert(user)) &#123;
            System.out.println(<span class="hljs-string">"success to insert a user information !"</span>);
        &#125; <span class="hljs-keyword">else</span> &#123;
            System.out.println(<span class="hljs-string">"fail to insert a new user information !"</span>);
        &#125;
    &#125;


    <span class="hljs-meta">@Ignore</span>
    <span class="hljs-meta">@Test</span>
    <span class="hljs-comment">// <span class="hljs-doctag">TODO:</span> 6/8/2019 测试修改用户信息操作 </span>
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">updateTest</span><span class="hljs-params">()</span> <span class="hljs-keyword">throws</span> SQLException </span>&#123;
        user.setId(<span class="hljs-number">1</span>);
        user.setName(<span class="hljs-string">"YUbuntu0109-1"</span>);
        user.setPassword(<span class="hljs-string">"MyPassword-1"</span>);
        <span class="hljs-keyword">if</span> (dbUtilsDao.update(user)) &#123;
            System.out.println(<span class="hljs-string">"success to update the user information !"</span>);
        &#125; <span class="hljs-keyword">else</span> &#123;
            System.out.println(<span class="hljs-string">"fail to update the user information !"</span>);
        &#125;
    &#125;

    <span class="hljs-meta">@Ignore</span>
    <span class="hljs-meta">@Test</span>
    <span class="hljs-comment">// <span class="hljs-doctag">TODO:</span> 6/8/2019 测试删除用户操作</span>
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">deleteTest</span><span class="hljs-params">()</span> <span class="hljs-keyword">throws</span> SQLException </span>&#123;
        <span class="hljs-keyword">if</span> (dbUtilsDao.delete(<span class="hljs-number">1</span>)) &#123;
            System.out.println(<span class="hljs-string">"success to delete the user information !"</span>);
        &#125; <span class="hljs-keyword">else</span> &#123;
            System.out.println(<span class="hljs-string">"fail to delete the user information !"</span>);
        &#125;
    &#125;

    <span class="hljs-meta">@Ignore</span>
    <span class="hljs-meta">@Test</span>
    <span class="hljs-comment">// <span class="hljs-doctag">TODO:</span> 6/8/2019 测试查询单个用户信息操作</span>
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">selectTest</span><span class="hljs-params">()</span> <span class="hljs-keyword">throws</span> SQLException </span>&#123;
        System.out.println(dbUtilsDao.select(<span class="hljs-number">1</span>));
    &#125;

    <span class="hljs-meta">@Ignore</span>
    <span class="hljs-meta">@Test</span>
    <span class="hljs-comment">// <span class="hljs-doctag">TODO:</span> 6/8/2019 测试查询所有用户信息操作</span>
    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">selectAllTest</span><span class="hljs-params">()</span> <span class="hljs-keyword">throws</span> SQLException </span>&#123;
        List users = dbUtilsDao.selectAll();
        System.out.println(users);
    &#125;
&#125;</code></pre></div></li>
</ol>

            </article>
            <hr>
            <div>
              <div class="post-metas mb-3">
                
                
                  <div class="post-meta">
                    <i class="iconfont icon-tags"></i>
                    
                      <a class="hover-with-bg" href="/tags/Java/">Java</a>
                    
                      <a class="hover-with-bg" href="/tags/JDBC/">JDBC</a>
                    
                  </div>
                
              </div>
              
                <p class="note note-warning">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-sa/4.0/deed.zh" target="_blank" rel="nofollow noopener noopener">CC BY-SA 4.0 协议</a> ，转载请注明出处！</p>
              
              
                <div class="post-prevnext row">
                  <div class="post-prev col-6">
                    
                    
                      <a href="/2019/06/12/Java-web%E9%A1%B9%E7%9B%AE-%E5%AD%A6%E7%94%9F%E7%AE%A1%E7%90%86%E7%B3%BB%E7%BB%9F/">
                        <i class="iconfont icon-arrowleft"></i>
                        <span class="hidden-mobile">Java web项目:学生管理系统</span>
                        <span class="visible-mobile">Previous</span>
                      </a>
                    
                  </div>
                  <div class="post-next col-6">
                    
                    
                      <a href="/2019/05/28/Spring-MVC%E4%B9%8BJSON%E6%95%B0%E6%8D%AE%E4%BA%A4%E4%BA%92%E5%92%8CRESTful%E6%94%AF%E6%8C%81/">
                        <span class="hidden-mobile">Spring MVC之JSON数据交互</span>
                        <span class="visible-mobile">Next</span>
                        <i class="iconfont icon-arrowright"></i>
                      </a>
                    
                  </div>
                </div>
              
            </div>

            
          </div>
        </div>
      </div>
    </div>
    
      <div class="d-none d-lg-block col-lg-2 toc-container" id="toc-ctn">
        <div id="toc">
  <p class="toc-header"><i class="iconfont icon-list"></i>&nbsp;TOC</p>
  <div id="tocbot"></div>
</div>

      </div>
    
  </div>
</div>

<!-- Custom -->


    
  </main>

  
    <a id="scroll-top-button" href="#" role="button">
      <i class="iconfont icon-arrowup" aria-hidden="true"></i>
    </a>
  

  
    <div class="modal fade" id="modalSearch" tabindex="-1" role="dialog" aria-labelledby="ModalLabel"
     aria-hidden="true">
  <div class="modal-dialog modal-dialog-scrollable modal-lg" role="document">
    <div class="modal-content">
      <div class="modal-header text-center">
        <h4 class="modal-title w-100 font-weight-bold">Search</h4>
        <button type="button" id="local-search-close" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body mx-3">
        <div class="md-form mb-5">
          <input type="text" id="local-search-input" class="form-control validate">
          <label data-error="x" data-success="v"
                 for="local-search-input">keyword</label>
        </div>
        <div class="list-group" id="local-search-result"></div>
      </div>
    </div>
  </div>
</div>
  

  

  

  <footer class="mt-5">
  <div class="text-center py-3">
    <div>
      <a href="https://hexo.io" target="_blank" rel="nofollow noopener"><span>Hexo</span></a>
      <i class="iconfont icon-love"></i>
      <a href="https://github.com/fluid-dev/hexo-theme-fluid" target="_blank" rel="nofollow noopener">
        <span>Fluid</span></a>
    </div>
    
  <div class="statistics">
    
    

    
      
        <!-- 不蒜子统计PV -->
        <span id="busuanzi_container_site_pv" style="display: none">
            总访问量 
            <span id="busuanzi_value_site_pv"></span>
             次
          </span>
      
      
        <!-- 不蒜子统计UV -->
        <span id="busuanzi_container_site_uv" style="display: none">
            总访客数 
            <span id="busuanzi_value_site_uv"></span>
             人
          </span>
      
    
  </div>


    

    
  </div>
</footer>

<!-- SCRIPTS -->
<script  src="https://cdn.staticfile.org/jquery/3.4.1/jquery.min.js" ></script>
<script  src="https://cdn.staticfile.org/twitter-bootstrap/4.4.1/js/bootstrap.min.js" ></script>
<script  src="/js/debouncer.js" ></script>
<script  src="/js/main.js" ></script>

<!-- Plugins -->


  
    <script  src="/js/lazyload.js" ></script>
  



  <script defer src="https://cdn.staticfile.org/clipboard.js/2.0.6/clipboard.min.js" ></script>
  <script  src="/js/clipboard-use.js" ></script>



  <script defer src="https://busuanzi.ibruce.info/busuanzi/2.3/busuanzi.pure.mini.js" ></script>





  <script  src="https://cdn.staticfile.org/tocbot/4.11.1/tocbot.min.js" ></script>
  <script>
    $(document).ready(function () {
      var boardCtn = $('#board-ctn');
      var boardTop = boardCtn.offset().top;

      tocbot.init({
        tocSelector: '#tocbot',
        contentSelector: 'article.markdown-body',
        headingSelector: 'h1,h2,h3,h4,h5,h6',
        linkClass: 'tocbot-link',
        activeLinkClass: 'tocbot-active-link',
        listClass: 'tocbot-list',
        isCollapsedClass: 'tocbot-is-collapsed',
        collapsibleClass: 'tocbot-is-collapsible',
        collapseDepth: 0,
        scrollSmooth: true,
        headingsOffset: -boardTop
      });
      if ($('.toc-list-item').length > 0) {
        $('#toc').css('visibility', 'visible');
      }
    });
  </script>



  <script  src="https://cdn.staticfile.org/typed.js/2.0.11/typed.min.js" ></script>
  <script>
    var typed = new Typed('#subtitle', {
      strings: [
        '  ',
        "DBUtils&nbsp;",
      ],
      cursorChar: "_",
      typeSpeed: 70,
      loop: false,
    });
    typed.stop();
    $(document).ready(function () {
      $(".typed-cursor").addClass("h2");
      typed.start();
    });
  </script>



  <script  src="https://cdn.staticfile.org/anchor-js/4.2.2/anchor.min.js" ></script>
  <script>
    anchors.options = {
      placement: "right",
      visible: "hover",
      
    };
    var el = "h1,h2,h3,h4,h5,h6".split(",");
    var res = [];
    for (item of el) {
      res.push(".markdown-body > " + item)
    }
    anchors.add(res.join(", "))
  </script>



  <script  src="/js/local-search.js" ></script>
  <script>
    var path = "/local-search.xml";
    var inputArea = document.querySelector("#local-search-input");
    inputArea.onclick = function () {
      searchFunc(path, 'local-search-input', 'local-search-result');
      this.onclick = null
    }
  </script>



  <script  src="https://cdn.staticfile.org/fancybox/3.5.7/jquery.fancybox.min.js" ></script>
  <link  rel="stylesheet" href="https://cdn.staticfile.org/fancybox/3.5.7/jquery.fancybox.min.css" />

  <script>
    $('#post img:not(.no-zoom img, img[no-zoom]), img[zoom]').each(
      function () {
        var element = document.createElement('a');
        $(element).attr('data-fancybox', 'images');
        $(element).attr('href', $(this).attr('src'));
        $(this).wrap(element);
      }
    );
  </script>







  
  
    <script>
      !function (e, t, a) {
        function r() {
          for (var e = 0; e < s.length; e++) s[e].alpha <= 0 ? (t.body.removeChild(s[e].el), s.splice(e, 1)) : (s[e].y--, s[e].scale += .004, s[e].alpha -= .013, s[e].el.style.cssText = "left:" + s[e].x + "px;top:" + s[e].y + "px;opacity:" + s[e].alpha + ";transform:scale(" + s[e].scale + "," + s[e].scale + ") rotate(45deg);background:" + s[e].color + ";z-index:99999");
          requestAnimationFrame(r)
        }

        function n() {
          var t = "function" == typeof e.onclick && e.onclick;
          e.onclick = function (e) {
            t && t(), o(e)
          }
        }

        function o(e) {
          var a = t.createElement("div");
          a.className = "heart", s.push({
            el: a,
            x: e.clientX - 5,
            y: e.clientY - 5,
            scale: 1,
            alpha: 1,
            color: c()
          }), t.body.appendChild(a)
        }

        function i(e) {
          var a = t.createElement("style");
          a.type = "text/css";
          try {
            a.appendChild(t.createTextNode(e))
          } catch (t) {
            a.styleSheet.cssText = e
          }
          t.getElementsByTagName("head")[0].appendChild(a)
        }

        function c() {
          return "rgb(" + ~~(255 * Math.random()) + "," + ~~(255 * Math.random()) + "," + ~~(255 * Math.random()) + ")"
        }

        var s = [];
        e.requestAnimationFrame = e.requestAnimationFrame || e.webkitRequestAnimationFrame || e.mozRequestAnimationFrame || e.oRequestAnimationFrame || e.msRequestAnimationFrame || function (e) {
          setTimeout(e, 1e3 / 60)
        }, i(".heart{width: 10px;height: 10px;position: fixed;background: #f00;transform: rotate(45deg);-webkit-transform: rotate(45deg);-moz-transform: rotate(45deg);}.heart:after,.heart:before{content: '';width: inherit;height: inherit;background: inherit;border-radius: 50%;-webkit-border-radius: 50%;-moz-border-radius: 50%;position: fixed;}.heart:after{top: -5px;}.heart:before{left: -5px;}"), n(), r()
      }(window, document);
    </script>
  














</body>
</html>
